Tombstone sleeve



FIG. 1 is a perspective view of a tombstone sleeve showing my new design;

FIG. 2 is a perspective view thereof, the broken lines form no part of the claimed design;

FIG. 3 is a top view thereof;

FIG. 4 is a front view thereof, the back view being the same; and,

FIG. 5 is a left side view thereof, the right side view being the same; and,

FIG. 6 is a bottom view thereof. 

The ornamental design for a tombstone sleeve, as shown and described. 